No, I never had this being displayed before but I have seen some pictures here on forums with the same icon and percentage displayed next to it.... Also, on DJI site demo video you can see the same display...

Attached Files:

The layout of that app is completely different than yours (it has the SD card icon - which is of a different design - where your battery icon is, etc).
I'm betting it's a different version of the app. Can you snoop when that photo was taken? That might give a clue to what version it could be. Or... are you sure you have the latest version?

It's a little tough to tell whether that's iOS or Android. Phone shape is definitely iPhone-ish... but so are 90% of the Android phones on the market. Can't really make out the telltale round "home" button of an iPhone... so maybe, just maybe it's Android. (nah... probably not)